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Sui C.,Northeast Agricultural University | Zhang W.,Northeast Agricultural University | Ye F.,Northeast Agricultural University | Liu X.,Heilongjiang Agricultural Engineering Vocational College | Yu G.,Northeast Agricultural University
Journal of Applied Polymer Science

Guar gum (GG) was incorporated into soy protein isolate (SPI) films using a blending solution casting method to form SPI/GG composite films. The effects of SPI and GG contents on the transparency, water susceptibility, mechanical, and gas-barrier properties of SPI/GG composite films were analyzed. The results showed that SPI/GG composite films with added GG were much more tensile-resistant, water-resistant, gas-barrier properties but less deformable property than SPI control film. The presence of GG also improved film barrier to the light. The analysis results of contact angle measurement, Fourier transform infrared spectroscopy, and scanning electron microscope indicated that GG induced increased network compactness of the composite films which resulted from strong intermolecular interactions, such as hydrogen bonding, that existed between SPI and GG. Findings indicate that GG may be used as a natural means to improve specific properties of SPI films. © 2016 Wiley Periodicals, Inc. Source

Lv X.,Harbin Engineering University | Lv X.,Heilongjiang Agricultural Engineering Vocational College | Shi D.,Harbin Engineering University | Wang Q.,Harbin Engineering University | Liang Q.,Harbin Engineering University
Journal of Vibroengineering

A unified solution for the in-plane vibration analysis of multi-span curved Timoshenko beams with general elastic boundary and coupling conditions by combining with the improved Fourier series method and Rayleigh-Ritz technique is presented in this paper. Under the current framework, regardless of boundary conditions, each of displacements and rotations of the curved Timoshenko beams is represented by the modified Fourier series consisting of a standard Fourier cosine series and several closed-form auxiliary functions introduced to ensure and accelerate the convergence of the series representation. All the expansion coefficients are determined by the Rayleigh-Ritz technique as the generalized coordinates. The convergence and accuracy of the present method are tested and validated by a lot of numerical examples for multi-span curved Timoshenko beams with various boundary restraints and general elastic coupling conditions. In contrast to most existing methods, the current method can be universally applicable to general boundary conditions and elastic coupling conditions without the need of making any change to the solution procedure. © JVE INTERNATIONAL LTD. Source

Feng S.,Heilongjiang University | Cao F.,Heilongjiang Agricultural Engineering Vocational College | Lu B.,Harbin Normal University | Cai Q.,Harbin Normal University
Journal of the Chinese Chemical Society

A magnetically separable catalyst Al2O3-MgO/Fe3O4 was prepared by Al2O3-MgO supported on magnetic oxide Fe3O4 and charactered by FT-IR, XRD and SEM. The mixed oxides afforded high catalytic activity and selectivity for synthesis of 1-phenoxy-2-propanol from phenol and propylene oxide with 80.3% conversion and 88.1% selectivity to 1-phenoxy-2-propanol. Especially, facile separation of the catalyst by a magnet was obtained and the catalytic performance of the recovered catalyst was unaffected even at the forth run. A magnetically separable catalyst Al2O3-MgO/Fe3O4 was prepared by Al2O3-MgO supported on magnetic oxide Fe3O4. The mixed oxides afforded high catalytic activity and selectivity for synthesis of 1-phenoxy-2-propanol from phenol and propylene oxide. The facile separation and reusability of the catalyst was achieved. Copyright © 2014 The Chemical Society Located in Taipei & Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, Germany. Source

Gao Y.X.,Northeast Forestry University | Gao Y.X.,Heilongjiang Agricultural Engineering Vocational College | Yang L.,Northeast Forestry University | Zu Y.G.,Northeast Forestry University | Yao L.P.,Northeast Forestry University
Advanced Materials Research

An ultrasound-assisted procedure for the extraction of pectin from heads of Helianthus annuus L. (sunflower) was established. A Box-Behnken design (BBD) was employed to optimize the extraction temperature (X1: 30-50°C), extraction time (X2: 20-40 min) and pH (X3: 2.5-3.5) to obtain a high yield of pectin with high degree of esterification (DE) from sunflower heads. Analysis of variance showed that the contribution of a quadratic model was significant for the pectin extraction yield and DE. An optimization study using response surface methodology was performed and 3D response surfaces were plotted from the mathematical model. According to the RSM model, the highest pectin yield (23.11 ± 0.08%) and DE (39.85 ± 0.14%)can be achieved when the UAE process is carried out at 50°C for 40min using a hydrochloric acid solution of pH 3.0. These results suggest that ultrasound-assisted extraction could be a good option for the extraction of functional pectin from sunflower heads at industrial level. © (2014) Trans Tech Publications, Switzerland. Source

Song L.-H.,Heilongjiang Agricultural Engineering Vocational College | Kang J.-Y.,Guangdong Industry Technical College
Advanced Materials Research

In accordance with the latest development direction in the filed of strengthening the heat transfer technology of strengthening the heat transfer on division of strengthening heat transfer by international authoritative Professor A.E. Bergle), including 3D(three-dimensional) heat transfer of ultra-high performance improved in the fins of the design and analysis; 3D heat transfer strengthening of the plowing process mechanism the flexibility ,high speed and high precision of gathered tools and the realization of a 3D digital design and manufacturing. It also researches on the influential law of process parameters on the formation of the fin. It is shown that the whole fin-forming process can be classified into three stages:plowing,heaving and fins forming, and that the front angle,plowing depth and the plowing speed are the main factors influencing the fin forming. Moreover,within a certain range,the height of fin increases with the front angle and the plowing depth. © (2011) Trans Tech Publications. Source

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